since this metagame is mostly community run isn't there a possibility to instead of just outright banning it. for there to be a way where you can limit it? for instance just banning psychic on latios or banning draco meteors? to make more pokemon able to come in. to make it less strong while still keeping it in a format for people that enjoy latios or for pokemon it keeps in check even if its just less checking. if you remove psychic clef becomes another option to deal with latios. remove draco meteor and dragon pulse although weaker still allows it to deal with garchomp while also letting more things switch in reliatively unscathed from a big nuke. i know that isnt really how things are usually done but i just want to put it out there.
In general Complex Bans where you only ban one aspect of the Pokemon are not favored. If you can make a complex ban argument for Latios such as no Draco, then why not allow Manaphy but no Tail Glow, or Gengar but no Shadow Ball? This is how you get things like Mewtwo is allowed in OU but you can only run Physical moves.